A mobile crane with a 75-foot boom is being used to lift materials. The load is 8,000 pounds and will be placed 60 feet from the crane's center of rotation. What is the primary safety concern?
Correct Answer
C) Load chart capacity limits
The primary concern is ensuring the lift does not exceed the crane's rated capacity as shown in the load chart. Capacity decreases significantly with radius, and exceeding limits can cause crane tip-over.
Why This Is the Correct Answer
Load chart capacity limits are the primary safety concern because crane capacity decreases dramatically as the load radius increases. At 60 feet from the center of rotation with an 8,000-pound load, the operator must verify this combination doesn't exceed the crane's rated capacity shown in the manufacturer's load chart. Exceeding these limits is the most common cause of crane tip-overs and catastrophic failures. The load chart is the definitive safety reference that accounts for boom length, load weight, and working radius.
Why the Other Options Are Wrong
Option B: Wind speed restrictions
Wind speed restrictions are important but typically become critical at higher wind speeds (usually above 20-25 mph). Without information about current wind conditions, and given the specific load and radius mentioned, capacity limits are the more immediate concern for this scenario.
Option D: Ground bearing pressure
While ground bearing pressure is important for crane stability, it's typically addressed during initial setup and site preparation. The immediate operational concern during this specific lift is whether the crane can safely handle the load at the given radius, not the ground conditions.
Memory Technique
Remember 'LRC' - Load + Radius = Check the Chart. The further out you go, the less you can lift.
Reference Hint
OSHA 1926 Subpart CC - Cranes and Derricks in Construction, specifically sections on load charts and capacity requirements
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